Elasticity and Toughness in Materials and Hardware
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Questions and Answers

What property is indicated by a metal's letter designation separated from the alloy designation by a dash?

  • Ductility
  • Malleability
  • Hardness (correct)
  • Tensile strength

Which type of steel does not accept heat treatment?

  • Medium-carbon steel
  • Manganese steel
  • High-carbon steel
  • Low-carbon steel (correct)

What property makes medium-carbon steels especially adaptable for machining or forging?

  • Desirable surface hardness
  • High ductility
  • High hardness
  • Ability to accept heat treatment (correct)

Which alloying agent acts as a hardener when alloyed with steel?

<p>Silicon (D)</p> Signup and view all the answers

In what applications are high-carbon steels primarily used?

<p>Springs, files, and cutting tools (C)</p> Signup and view all the answers

What characteristic makes Mangalloy unique?

<p>Extreme anti-wear properties (B)</p> Signup and view all the answers

Which property refers to a metal's tendency to return to its original shape after stretching and bending?

<p>Elasticity (C)</p> Signup and view all the answers

What property describes a material's ability to resist tearing or breaking when bent or stretched?

<p>Toughness (C)</p> Signup and view all the answers

When a metal can carry heat or electricity, it is said to have good ____________.

<p>Conductivity (B)</p> Signup and view all the answers

What is the term for the property of a metal to expand when heated and shrink when cooled?

<p>Thermal Expansion (A)</p> Signup and view all the answers

Which property involves a material's ability to absorb heat before conducting or carrying it away?

<p>Conductivity (C)</p> Signup and view all the answers

Metals that can carry heat also carry ____________, making them good electrical conductors.

<p>'Electrons' (C)</p> Signup and view all the answers

What can be added to steel to counteract the negative effects of sulphur?

<p>Manganese (A)</p> Signup and view all the answers

How does phosphorus affect low-carbon steel's resistance to atmospheric corrosion?

<p>Improves resistance (D)</p> Signup and view all the answers

What does nickel contribute to steel during the heat treatment process?

<p>Adds strength and hardness (C)</p> Signup and view all the answers

What effect does manganese have on a metal's forging characteristics?

<p>Makes it less brittle at rolling and forging temperatures (A)</p> Signup and view all the answers

How does adding small amounts of sulphur affect the machinability of steel?

<p>Improves machinability (D)</p> Signup and view all the answers

What undesirable effect does sulphur have on steel when rolled or forged?

<p>Causes brittleness (A)</p> Signup and view all the answers

What is the main characteristic of chromium steel?

<p>Increased wear and corrosion resistance (D)</p> Signup and view all the answers

How does nickel contribute to steel when alloyed with chromium?

<p>Toughens steel (B)</p> Signup and view all the answers

What is the primary purpose of molybdenum in aircraft structural steel?

<p>To reduce grain size and increase impact strength (C)</p> Signup and view all the answers

Why is chrome-moly steel an ideal choice for landing gear structures?

<p>Excellent wear resistance (B)</p> Signup and view all the answers

What type of steel alloy does vanadium produce when combined with chromium?

<p>Strong, tough, and ductile (A)</p> Signup and view all the answers

In what components are ball bearings typically made, according to the text?

<p>Chrome-vanadium steel (A)</p> Signup and view all the answers

What is the primary element responsible for the mechanical properties of steel?

<p>Carbon (A)</p> Signup and view all the answers

What is the main objective of heat treatment in steel?

<p>Change physical and mechanical properties (B)</p> Signup and view all the answers

Why are high-carbon steels particularly suitable for heat treatment?

<p>They respond well to heat treatment (D)</p> Signup and view all the answers

What does the annealing process do to steel?

<p>Softens and relieves internal stress (A)</p> Signup and view all the answers

Which material exceeds commercial use compared to any other material?

<p>Steel (A)</p> Signup and view all the answers

How does heat treatment impact product performance in manufacturing processes?

<p>By increasing strength or other desirable characteristics (D)</p> Signup and view all the answers

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